:root{
  --background-color : white;
  --chapter-width: 125px;
  --menu-height: 48px;
  --menu-font-size: 24px;
  --link0-font-size:18px;
  --link1-font-size:16px;
  --link2-font-size:14px;
}

.book-root{
  display: flex;
  flex-direction: column;
}

.book-menu{
  display: flex;
  height: var(--menu-height);
  flex-direction: row;
  width: 100vw;

  box-sizing: border-box;
  /* border: 1px solid red; */
}
  .book-menu label{
    margin-top: auto;
    margin-bottom: auto;
    margin-left: 5px;
    font-size: var(--menu-font-size);
    font-weight: bold;
  }

.book-containt{
  background-color: var(--background-color);
  display: flex;
  flex-direction: row;

  position: absolute;
  top:var(--menu-height);

  width: 100vw;
  height: 100%;
  height: calc(100vh - var(--menu-height));

  box-sizing: border-box;
  /* border: 1px solid red; */
}

.book-chapter{
  min-width: var(--chapter-width);
  height: 100%;

  overflow-y: auto;

  box-sizing: border-box;
  border-right: 1px solid black;
}

.book-content{
  display: flex;
  flex-direction: column;
  min-width: 480px;
  width: 100%;
  height: 100%;
  overflow: auto;

  box-sizing: border-box;
  border: 1px solid black;
}

.book-link0{
  margin-left: 5px;
  font-size: var(--link0-font-size);
  font-weight: bold;
  text-decoration: underline;
}

.book-link1{
  padding-left: 10px;
  font-size: var(--link1-font-size);
  font-weight: bold;
  text-decoration: underline;
}

.book-link2{
  padding-left: 15px;
  font-size: var(--link2-font-size);
  font-weight: bold;
  text-decoration: underline;
}

.clickable:hover{
  cursor: pointer;
  color: #1982cc;
}

.selected{
  color: red;
}